Abstract
The stabilized lasers play important roles in the development of atom and molecule physics, metrology, communication systems, precision measurement and atomic clock. In the past, the frequency of light source laser is stabilized to the certain atomic or molecular transitions. In the thesis, we measure the absolute frequency of iodine hyperfine transitions (R(78) 4-6) by optical frequency comb. The precise frequency measurement of the a1 component is 446806191.649(23) MHz at the vapor pressure 26.6 Pa. However, the absolute frequency of the a1 component is different about 2.92 MHz to the value of IodineSpec5 software. The main reason is not enough data in this wavelength (667 nm - 775 nm). The frequency stabilized system acts as a reference laser and is locked the hyperfine a1 component of R(78) 4-6 transition of 127I2 at 671 nm by modulation transfer spectroscopy. Therefore, the system can help us to study the lithium D lines in the future work.